Thermal conductivity of HFC-32, HFC-125, and HFC-134a in the solid phase

Journal Article · Sun Mar 01 04:00:00 EST 1998 · International Journal of Thermophysics

DOI:https://doi.org/10.1023/A:1022509310134· OSTI ID:675550

Gao, X; Nagasaka, Y; Nagashima, A ^[1]

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1. Keio Univ., Yokohama (Japan). Dept. of Mechanical Engineering

Measurements of the thermal conductivity of HFC-32, HFC-125, and HFC-134a were carried out for the first time in both solid and liquid phases at the saturation pressure at room temperature and in the temperature ranges from 120 to 263, from 140 to 213, and from 130 to 295 K, respectively. A transient hot-wire instrument using one bare platinum wire was employed for measurements, with an uncertainty of less than {+-}2%. The experimental results demonstrated that the thermal conductivity of HFC-32, HFC-125, and HFC-134a in the solid phase showed a positive temperature dependence. For HFC-32 and HFC-125, there were big jumps between the solid and the liquid thermal conductivity at the melting point. But for HFC-134a, the solid and liquid thermal conductivity at the melting point is almost-continuous.

• OSTI ID: 675550
• Report Number(s): CONF-970629--
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 2 Vol. 19; ISSN 0195-928X; ISSN IJTHDY
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
AMBIENT TEMPERATURE
HALOGENATED ALIPHATIC HYDROCARBONS
LIQUIDS
MELTING POINTS
REFRIGERANTS
SOLIDS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL CONDUCTIVITY